[PATCH] drm/amd/display: Move drm_dp_mst_atomic_check() to the front of dc_validate_global_state()

[Zhan Liu]

[Why]
Need to do atomic check first, then validate global state.
If not, when connecting both MST and HDMI displays and
set a bad mode via xrandr, system will hang.

[How]
Move drm_dp_mst_atomic_check() to the front of
dc_validate_global_state().

Signed-off-by: Zhan Liu <zhan.liu at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index eed3ed7180fd..805d8d84ebb8 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -8256,6 +8256,16 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 			goto fail;
 #endif
 
+		/*
+		 * Perform validation of MST topology in the state:
+		 * We need to perform MST atomic check before calling
+		 * dc_validate_global_state(), or there is a chance
+		 * to get stuck in an infinite loop and hang eventually.
+		 */
+		ret = drm_dp_mst_atomic_check(state);
+		if (ret)
+			goto fail;
+
 		if (dc_validate_global_state(dc, dm_state->context, false) != DC_OK) {
 			ret = -EINVAL;
 			goto fail;
@@ -8284,10 +8294,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 				dc_retain_state(old_dm_state->context);
 		}
 	}
-	/* Perform validation of MST topology in the state*/
-	ret = drm_dp_mst_atomic_check(state);
-	if (ret)
-		goto fail;
 
 	/* Store the overall update type for use later in atomic check. */
 	for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) {
-- 
2.17.1